Radio signaling system



Patented Jan. ZZZ, I929.

unirrn snares mam raven-r OFFICE.

MAX 0. BATsnL, or wrtnrnsnune, PENNSYLVANIA, nssreivon rownsrmcnousn nnnoraro & MANUFACTURING cor/many, A CORPURATION or PENNSYLVANIA.

RADIO SIGNALING SYSTEM.

My invention relates to systems for the transmission of signals by radio frequency currents and it has particular relation to circuits for heating the cathodes of thermionic discharge devices.

Broadly speaking, the object of my invention is to provide a more convenient system of connections for use in heating the cathodes of a plurality of thermionic discharge devices in a radio signaling systenifrom a plurality of heating current sources.

A further object of my invention is to control the heatinn of the cathodes of a plurality of thermion c discharge devices from a plurality of currentsources by means of a single rheostatic control device. v A further object of my invention is to heat the cathodes of a plurality of thermionic discharge devices from a plurality of current sources, keeping the various sources connected, respectively, independently to their various cathodes but all under the con trol oi a single rheostatic means.

' In carrying my invention into effect, in a r typical radio apparatus having a plurality of thermionic discharge triode devices, each having a cathode heated by electrical means, I connect one terminal of each cathode to a common conductor which, in turn, is connected to one terminal of a rheostatic control device. To the other terminal of the rheostatic device, I connect another common conductor which, in turn, I connect to like terminals of all of the cathode heating devices. I then complete the circuits of the respective current sources and cathodes by a plurality of independent connectors.

Other objects and structural details of my invention will be apparent from the following description when read in connection with the accompanying drawings, wherein The single figure is a diagrammatic slccl'ch of a typical radio receiver circuit containing a detector triode, a plurality of amplifier triodes and a plurality of current sources for cathode heating. i

In this receiver, a radio receptor circuit 1 of a customary type is provided. A detector triode tube 2 and amplifier triode tubes 3, i and 5 are provided. One terminal of the cathode of each of the triode tubes 2, 3,

t and 5 is connected to a common conductor 6. This, in turn, is connected to an adjustable rheostat 7. A second common conductor 8 is connected to the negative terminal of current sources l2, 18, 1a and 15.

The positive terminal of current source 12 is connected to the ren'iaining terminal of the cathode of triode tube 2 by a conductor 22. The positive terminal. of source 13 is connected to the cathode of tube 3 by a conductor 23. The positive terminal of source 14 is connected to the cathode of tube a by conductor 24. and the positive terminal of source 15 connected to the cathode of tube 5 by a c0nductor25.

By this system of connections, I am enabled to provide each triodc thermionic discharge device with, its own independent heating current supply. This is particularly desirable in the case of the low voltage or so-called dry battery triode devices. By providing an independent ourrentsource for each filament, the load upon the current source kept to a minimunnand optimum life oi the current source obtained.

In the operation of a radio detector and amplifier system, it has been found that the amplified tubes will operate satisfactorily on a lower filainentsupply voltage than is required for satisfactory operation of the detector tube. I have foundthat, in employing an ordinary dry cell, it develops a higher voltage for the first few hours than it does for the remainder ofits life. It is, therefore, possible to connect a new dry cell to the detector tube, the new cell being source 12, as shown in the drawing, and employ tor the remainder of the sources, cells which have passed the peak of'their voltage. This arrangement enables the provision of a single rheostat for the control of the filament current in a number of tubes and, at the same time, obtain the desired higher voltage upon the detector tube. It further insures maximum service from each cell and permits the newest cell to supply the detector at all times, and thereby to provide the necessary voltage from the detector tube filament cathode. f

While I have shown only one embodiment of my invention in the accompanying drawings, it is capableof various changes and modifications without departing from the spirit thereof, and it is desired, therefore, that only such limitations shall be imposed thereon as are indicated in the prior art or in the appended claims.

I claim as my invention:

1. A radio receiving system comprising a radio receptorcircuit, a radio detector circuit connected thereto, a plurality of triode thermionic discharge devices connected to said detector circuit, each comprising an electrically heated cathode having two terminals, energy transfer means intermediate said triodes, a common connection to one terminal of each of said cathodes, a plurality of current sources each having two terminals, a common connection to one like terminal of each of said current sources, rheostatic control means connected intermediate said common connections, and a plurality of connections each completing the circuit of the respective current source through the respective cathode. a

2. In a radio system comprising a plurality of thermionic discharge devices, each of said devices comprising an electrically heated cathode and two terminals therefor, a plurality ofx cathode heating current sources, a plurality of common conducting means, one of saidconducting means being connected to a terminal of each of said cathodes, another of said conducting means being connected to each of said cathode heating sources rheostaticcontrol means, said rheostatic means being connected intermediate said common connecting means and means for completing the respective circuits from said current sources to the corresponding cathodes.

3. In a radio receiving system, a plurality of thermionic discharge devices each comprising an electrically heated cathode having two terminals, a plurality of cathode heating current sources, rheostatic control means, and a plurality of connecting means between saidcathodes and said current sources, one of said connecting means being connected in common to one terminal of each cathode, another of said connecting means being connected in common to one like terminal of each of said current sources, and others of said connecting means being connected respectively between the second terminal of said current sources and the second terminal of said cathodes, and said rheostatic control means being connected in termediate said common conducting means.

4. In a radio system comprising a plurality of thermionic discharge devices each comprising an electrically heated cathode, a plurality of cathode heating current sources, and a plurality of cathode heating circuits, each of said circuits comprising a plurality of connectors, a plurality of saidconnectors being common to all of said cathode heating circuits.

5. In a radio system comprising a plurality of thermionic discharge devices, each of said devices comprising an electrically heated cathode; a plurality of cathode heating current sources, rheostatic control means and a plurality of cathode heating current circuits, each of said circuits comprising a plurality of connectors, a plurality of said connectors being connected in common to all of said cathode heating currents circuits, said rheostatic means being connected intermediate two of said connectors common to said cathode heating current circuits.

In testimony whereof, I have hereunto subscribed my name this 20th day of October, 1923.

, MAX C. BATSEL. 

